Have looked further at our FCOMs and I notice that Hotrods line is indeed on the IAE 320 but not the CFM 319 & 320 or IAE 321.
Full extension - Landing phase
If the ground spoilers are armed and all thrust levers are at idle, the ground spoilers will automatically extend as soon as both main landing gears have touched down.
If the ground spoilers are not armed and both main landing gears have touched down, the ground spoilers will automatically extend as soon as reverse is selected on one engine (the other thrust lever remains at idle).
Note :
In autoland, the ground spoilers fully extend at half speed one second after both main landing gears touch down.
I cannot be sure, but my understanding that the thrust levers still need to be idle, but the ground spoilers will extend in a different way during autoland.